Fuel-saving device



April 21, 1931.

w. KREFT 1,802,023

FUEL SAVING DEVICE Filed Sept. 25, 1929 Inventor WILLIAM KKEFT A fformqy 49 wise wasted gases Patented Apr. 21 '1931 Umrao s A THIS I .PATENT-DFFICE Application filed September 25, 1928. Serial No. 395,101.

My invention relates to improvements in fuel-saving devices, and has among its objects the production of such a device that may be placed in the smoke stack'leading from a heating plant such as a furnace, boiler or the like, and which may be used to utilize the stack gases that would otherwise be wasted.

The invention has among its objects, the production of such a device which shall be simple, convenient to install and operate, economical, sturdy, and reliable and eflicient for use wherever found applicable.

Another object of my invention is to provide a fuel saver of the kind described, which will also act as a smoke abater," and which may beeasily cleaned at suitableintervals.

Many other objects and advantages of the construction herein shown and described, will be obvious to those skilled in the art to which this invention appertains, from the disclosures herein given.

To this end, my invention consists inthe novel construction, arrangement, and combination of parts herein shown and described,

Y and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like or corresponding parts throughout,

Figure 1 is a vertical section through my improved device, part1 in elevation, as ,ar ranged in position; and s Flgure 2 is a plan view of an element thereof. V y

In the drawings, wherein I have illustrated a preferred embodiment of my invention, A- indicates any type or desi of heating plant such as a furnace for coa oil, etc., in which heat is generated, and from which the otherass into the air through the smoke stack in icated at B and B.

In order to utilize these ordinarily wasted heated gases that passout through the stack, I interpose a device between the adjacent sections of the stack B-B-, preferably'near the outlet from the furnace, as the gases are hottest at this point, said device serving not only to heat a liquid such as water therein, but serving the additional purpose of reducing the amount of smoke and the density of the same exuded from the top of the stack.

The device preferably comprises a tubular element 1, of considerably larger diameter than the smoke stack so as not to cut. down the required draft, the ends of the element having the end plates 2 and 3 therefor,'somewhat as shown in Figure 2, each of the end plates having openings 4 therethrough to permit of the free passage of gases through the stack.

may be placed at the upper end of the tubular element or container 1, to cover the same thereat, above the end member 2, said dome section communicating with the section B of the stack.

A spirally coiled conduit such as the pipe 6 having the inlet end 7 and'outlet end 8, is arranged within the tubular element 1, adja cent the inside periphery thereof, and through which water or other liquid may be conducted for any purpose, such as for providing hot water or the like; If desired, a metallic packing material, such as crinkled copper strands 9, or other good heat-conducting material, may be interposed between the adjacent coils of the pipe 6 so as to. prevent free passage therebetween.

upwardly through the stack will be directed 7 m a winding, tortuous, spiral path, being deflected outwardly toward and onto the coiled pipe 6 to heat the liquid therein. If desired, the surfaces of the member 10 may be covered with asbestos orrother suitable material, 00

A specially constructed dome section 5 m to cause eddying currents therein and otherwise slow up the speed of the gases, and to retain the container in as highly a heated condition" as os'sible. To this end, the outer surface of t a container may be covered with suitable insulating material such as asbestos.

The area of thepassagew'ay through the s iral means is preferably designed so as to substantially e ual to the stack sections B and B, so that a though the speed. of the gases is slowed up in passing through the container, yet the draft is not reduced, or at least not materially reduced.

I In order to permit the heat to reach the pipe 6 and yet prevent most of the solid particles in the smoke from reaching-and settling on the pipe to thereby impair its aficiency, I have preferably arranged a screen. 11 to surround the member 10, between the la ter and the pipe 6, the screen being closely adjacent the peripheral edges of the member 10 for a pur ose to be hereinafter described.

With t e construction. just described, of the heated gases and solid particles chargflad upwardly of the stack will travel a spira y circuitous path through the container inter osed between the stack sections B and B, w erein their speed is reduced and the heat is utilized to heat the liquid that is in the pipe 6, and the solid particles will strike a amst the vane member and the screen and either fall back into the furnace or cling to or be deposited on these parts.

In order to provide means for easily and readily cleaning the parts that are most apt to receive deposits of these solid particles thereon, I have provided means for scraping the screen. To this end the vane member is carried or fixed to a shaftl?) Whose lower and rests upon a ball bearing 13 placed centrally within the end plate i, said ball being sup ported u on a wear block 14 resiliently and adjustab y held in place by a spring 15 whose spring pressure is adjustably regulated by a screw 16.

Driving means, such as the meshing gears 17 and 18 are arran d at the other end of the shaft, the gear 1 being keyed or otherwise connected to the shaft, and'there being an annular ball bearin 19 at said-end. The gears are driven throug a shaft 20, either by and or through other source of power, as for example a motor (not shown).

Rotationvof the deflector element 10 will cause its edges to scrape off the sediment that me have become deposited uponthe screen,

1 an also shaking off those particles that may have settled u 11 itself, these particles fall-- ing through t e openin 4 of the bottom plate element 3, either into the furnace or onto the bottom portion of the inside of the stack section B. A door 21 may be placed on said section of the stack, to form a closure for a suitable opening Q2 therein, and by means of which cleaning out oi the deposits may be efiected, and whereby the screw 16 may be adjusted.

Having thus described my invention it is obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention; hence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein shown and described, except as limited by the claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a device of the kind described and in combination with a smoke stack, a container adapted to be arranged in the path of the gases through said stack, a coiled pipe in said container, a screen covering said pipe, and a rotatable spirally extending vane in said container to define a spirally-extending passage way therethrough to deflect said gases onto said pipe, the rotative movement or said vane acting to remove solid matter from said screen.

2. In a device of the hind described and in combination, a container formin a portion of a smoke stack, a spirally coiled pipe within said container and ads ted to have liquid conducted therethroug metal packing means between adjacent coils of said pipe to prevent free passage therebetween, means forming a spiral passageway throu h said container and openint adjacent said coiled pipe so as to'deficct the heated gases thereonto, acireularly extending screen between the periphery of said hast mentioned means and said pipe, and means for rotating said spiral-passageway 'jorming means to remove solid matter from the screen.

3. In a device of the kind described and in combination with the Smokestack of a heating plant a container adapted to be arranged in the path ing plant and forming a section of said stack a spirally extending deflector within said container, a perforated wall closely encirclin said deflector and spaced from the inside in of the container, and means in thespace between said wall and container for conducting the heat therefrom whereby said heated gases will be deflected radiall outwardl into said space to be utilizable t erein sai wall actof the heated gases from said heata ing as a filter for solid partic es deflected by said deflector means.

4. In a device of the kind described and in combination with a smoke stack, a container adapted to bearranged in the ath of the gases through said stack, a lengt of pipe in movement of said vane acting to remove solid matter from said inner wall.

5. In a device of the kind described and in combination with a smoke stack, a container adapted to be arranged in the gases through said stack a in sand container, a vane movahl said container to define a spira passageway therethrough to deflect said gases toward said pipe, and a perforate wall between said pipe and vane, the movement of said vane acting" to remove solid matter from said wall.

KREFT. 

